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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Aromatic-ring-hydroxylating dioxygenases ： ウィキペディア英語版 Aromatic-ring-hydroxylating dioxygenases Aromatic-ring-hydroxylating dioxygenases (ARHD) incorporate two atoms of dioxygen (O2) into their substrates in the dihydroxylation reaction. The product is (substituted) ''cis''-1,2-dihydroxycyclohexadiene, which is subsequently converted to (substituted) benzene glycol by a ''cis''-diol dehydrogenase. A large family of multicomponent mononuclear (non-heme) iron oxygenases has been identified. Components of bacterial aromatic-ring dioxygenases constitute two different functional classes: hydroxylase components and electron transfer components. Hydroxylase components are either (αβ)''n'' or (α)''n'' oligomers. Two prosthetic groups, a Rieske-type () center and a mononuclear iron, are associated with the α-subunit in the (αβ)''n''-type enzymes. Electron transfer components are composed of flavoprotein (NADH:ferredoxin oxidoreductase) and Rieske-type () ferredoxin. In benzoate and toluate 1,2-dioxygenase systems, a single protein containing reductase and Rieske-type ferredoxin domains transfers the electrons from NADH to the hydroxylase component. In the phthalate 4,5-dioxygenase system, phthalate dioxygenase reductase (PDR) has the same function. PDR is a single protein comprising FMN-binding reductase and plant-type ferredoxin domains. Thus, the electron transfer in ARHD systems can be summarised as: ==Biochemical classification== benzene 1,2-dioxygenase : benzene + NADH + H+ + O2 = ''cis''-cyclohexa-3,5-diene-1,2-diol + NAD+ phthalate 4,5-dioxygenase : phthalate + NADH + H+ + O2 = ''cis''-4,5-dihydroxycyclohexa-1(6),2-diene-1,2-dicarboxylate + NAD+ 4-sulfobenzoate 3,4-dioxygenase : 4-sulfobenzoate + NADH + H+ + O2 = 3,4-dihydroxybenzoate + sulfite + NAD+ 4-chlorophenylacetate 3,4-dioxygenase : 4-chlorophenylacetate + NADH + H+ + O2 = 3,4-dihydroxyphenylacetate + chloride + NAD+ benzoate 1,2-dioxygenase : benzoate + NADH + H+ + O2 = 1,2-dihydroxycyclohexa-3,5-diene-1-carboxylate + NAD+ toluene dioxygenase : toluene + NADH + H+ + O2 = (1''S'',2''R'')-3-methylcyclohexa-3,5-diene-1,2-diol + NAD+ naphthalene 1,2-dioxygenase : naphthalene + NADH + H+ + O2 = (1''R'',2''S'')-1,2-dihydronaphthalene-1,2-diol + NAD+ terephthalate 1,2-dioxygenase : terephthalate + NADH + H+ + O2 = (1''R'',6''S'')-dihydroxycyclohexa-2,4-diene-1,4-dicarboxylate + NAD+ biphenyl 2,3-dioxygenase : biphenyl + NADH + H+ + O2 = (1''S'',2''R'')-3-phenylcyclohexa-3,5-diene-1,2-diol + NAD+ 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aromatic-ring-hydroxylating dioxygenases」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.